Anyone else notice a lower SD/ES when you use a can?

Discussion in 'Reloading Forum (All Calibers)' started by Eternal Student, Mar 15, 2019.

  1. Eternal Student

    Eternal Student

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    I have started to notice that when I put on my Gemtech that the SD is lower-consistently. It usually cuts it in 1/3 or even 1/2. The last group I shot had an ES of 14 and it dropped to 6fps when I put on the can. It could have been just a good group of rounds but I notice numbers like that group after group.
    Anyone else had this experience or maybe even the opposite??
    Thanks
     
  2. Doug Beach

    Doug Beach

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    Depending on the type of chronograph, is it possible that you have it too close, and the unsuppressed blast is affecting your readings?
     
  3. B23

    B23

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    It will be interesting to see the replies on this because I swear, my 17 WSM has, MUCH, less crazy extreme velocity spreads with the can screwed on the end than it does without it. The 17 WSM is a rimfire and the ammo is far from match grade so I really have no way of knowing if it's purely coincidence or if there is something about having a can on it that somehow evens out the pressure curve, but when I've chronographed it the ES always seems to be way better when I have the can on it.

    Considering I shoot just about everything suppressed, hopefully someone has some hard evidence regarding suppressors affecting ES/SD in a positive way. I'm always looking for another good selling point to use with my wife so I can convince her I need to buy another can. ;)
     
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  4. watercam

    watercam Gold $$ Contributor

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    Kind of makes sense. Pressure rises a bit with a can, perhaps it allows some kind of mediation of the pressure release at the muzzle.
     
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  5. fatelvis

    fatelvis Silver $$ Contributor

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    I just wish I had the chance to experience a suppressor. Gotta love Illinois!
     
  6. danny

    danny

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    Eventually, I would like to mount a Campbell's Soup Can (Cream of Tomato) on a rifle.

    Danny
     
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  7. Eternal Student

    Eternal Student

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    That is a good point but not true in this instant. I have a MagnetoSpeed and been using a friends Lab-radar as another chrono. Both have been on the money.
     
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  8. D-4297

    D-4297

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    I think I'd be more concerned about my target groupings , than either ES or SD . I've shot some very good scores with some ridiculous SD numbers , as well as some very poor scores with SD down in the 5 range . I do think SD / ES has some relevance , but not as much as we sometimes attribute to it . I don't shoot with a suppressor , so I really can't give a point of reference , other than , if it groups good , shoot it . If not , find the best way to get good consistent groups . With or without the suppressor .
    And for my own personal information , Why do you need a suppressor on a 17WSM ? I really am curious about that .
     
  9. Eternal Student

    Eternal Student

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    Yeah... Illinois sucks. No offense to you. :)

    Maybe the can puts just enough back pressure to help the powder burn better/more efficient????
     
  10. Jacob.A

    Jacob.A

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    If you've got a can for it, why not use it?
     
  11. Homerange

    Homerange

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    Regardless of caliber they suppress the shots origin.
    In a paddock full of rabbits this gives the shooter a massive advantage.
     
  12. B23

    B23

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    I can only speak for myself, but "need" has absolutely nothing to do with it. I probably don't "need" A LOT of the stuff I have but that doesn't mean I enjoy it any less. As for shooting things suppressed, again, I can only speak for myself, but once I started shooting things suppressed, I really enjoyed the lack of muzzle blast and I've kinda become addicted to the lack of noise, even in rimfires and I'm not so sure they haven't made me a better shooter.
     
  13. Homerange

    Homerange

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    Probably, if you're anything like my age and shot with unsuppressed rifles for years you brain has been programmed to ready itself for the audible hurt and that doesn't help for fine marksmanship.
    A suppressor does help and wearing a set of muffs as well even more....try it.

    Further, suppressors dampen the barrel harmonics and all my rifles shoot better with them fitted.
     
  14. Zero333

    Zero333 Silver $$ Contributor

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    It might be possible the transitional ballistics inside the suppressor may be affecting the bullet's air resistance to the tune of more uniform velocities ? Each chamber acts like a air velocity damper uniformly from shot to shot ?

    Maybe I need some sleep because I'm not making any sense ??
     

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